Mechanics

CHEVY MY TRUCK WON'T SHIFT

1992 Chevrolet Cheyenne

Transmission problem
1992 Chevy Cheyenne 6 cyl Two Wheel Drive Automatic 252525 miles

I want to know three things. First why would me truck not go into drive or 3rd gear after having transmission rebuilt and tested on a shaffer shifter? Second is there any computers for my year truck that runs the transmission? If there is not, what is wrong with my transmission? Someone please help.
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JVitulano
January 6, 2010.



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